Excellent

Im currently using his app to help with my musicianship class at Berklee, and it works wonderfully. Essentially a mini course in ear training. The people complaining in the other reviews are mostly annoyed that they cant do well in the exercises. While its easy to try to blame the iPhones speakers, its really just a matter of practice, and this app is perfect for that exact practice.

Zachary Thomas about Ear Trainer, v2.5